package com.zenithmind.document.service.impl;

import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zenithmind.common.context.UserContext;
import com.zenithmind.document.mapper.DocumentMapper;
import com.zenithmind.document.pojo.domain.Document;
import com.zenithmind.document.pojo.dto.DocumentCreateDTO;
import com.zenithmind.document.pojo.dto.DocumentUpdateDTO;
import com.zenithmind.document.pojo.dto.DocumentUploadDTO;
import com.zenithmind.document.pojo.query.DocumentQueryDTO;
import com.zenithmind.document.pojo.vo.DocumentDetailVO;
import com.zenithmind.document.pojo.vo.DocumentStatisticsVO;
import com.zenithmind.document.pojo.vo.DocumentVO;
import com.zenithmind.document.service.DocumentService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;

/**
 * 文档服务实现类
 * 
 * @author ZenithMind Team
 * @since 2025-01-09
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class DocumentServiceImpl extends ServiceImpl<DocumentMapper, Document> implements DocumentService {

    @Override
    @Transactional(rollbackFor = Exception.class)
    public DocumentVO uploadDocument(DocumentUploadDTO uploadDTO) {
        log.info("上传文档: {}", uploadDTO.getFile().getOriginalFilename());
        
        // TODO: 实现文档上传逻辑
        // 1. 文件存储
        // 2. 内容提取
        // 3. 预览生成
        // 4. 缩略图生成
        // 5. 保存文档信息
        
        return null;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public DocumentVO createDocument(DocumentCreateDTO createDTO) {
        log.info("创建文档: {}", createDTO.getName());
        
        Document document = new Document();
        BeanUtils.copyProperties(createDTO, document);
        document.setCreatorId(UserContext.getUserId());
        document.setCreateTime(LocalDateTime.now());
        document.setUpdateTime(LocalDateTime.now());
        
        save(document);
        
        return convertToVO(document);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean updateDocument(String id, DocumentUpdateDTO updateDTO) {
        log.info("更新文档: {}", id);
        
        Document document = getById(id);
        if (document == null) {
            throw new RuntimeException("文档不存在");
        }
        
        BeanUtils.copyProperties(updateDTO, document);
        document.setLastModifierId(UserContext.getUserId());
        document.setUpdateTime(LocalDateTime.now());
        
        return updateById(document);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean deleteDocument(String id) {
        log.info("删除文档: {}", id);
        
        Document document = getById(id);
        if (document == null) {
            throw new RuntimeException("文档不存在");
        }
        
        document.setStatus(2); // 已删除
        document.setUpdateTime(LocalDateTime.now());
        
        return updateById(document);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean batchDeleteDocuments(List<String> ids) {
        log.info("批量删除文档: {}", ids);
        
        return baseMapper.batchUpdateDocumentStatus(ids, 2) > 0;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean restoreDocument(String id) {
        log.info("恢复文档: {}", id);
        
        Document document = getById(id);
        if (document == null) {
            throw new RuntimeException("文档不存在");
        }
        
        document.setStatus(1); // 正常
        document.setUpdateTime(LocalDateTime.now());
        
        return updateById(document);
    }

    @Override
    public IPage<DocumentVO> getDocumentPage(DocumentQueryDTO queryDTO) {
        log.info("分页查询文档");
        
        Page<DocumentVO> page = new Page<>(queryDTO.getCurrent(), queryDTO.getSize());
        String userId = UserContext.getUserId();
        
        return baseMapper.selectDocumentPageWithDetails(page, queryDTO, userId);
    }

    @Override
    public DocumentDetailVO getDocumentDetail(String id, String userId) {
        log.info("获取文档详情: id={}, userId={}", id, userId);
        
        // 记录访问
        recordDocumentAccess(id, userId, "view");
        
        return baseMapper.selectDocumentDetailWithUser(id, userId);
    }

    @Override
    public List<DocumentVO> searchDocuments(String keyword, String userId, Integer limit) {
        log.info("搜索文档: keyword={}, userId={}", keyword, userId);
        
        return baseMapper.searchDocuments(keyword, userId, limit);
    }

    @Override
    public List<DocumentVO> fullTextSearchDocuments(String searchText, String userId, Integer limit) {
        log.info("全文搜索文档: searchText={}, userId={}", searchText, userId);
        
        return baseMapper.fullTextSearchDocuments(searchText, userId, limit);
    }

    @Override
    public List<DocumentVO> getUserDocuments(String userId, Integer limit) {
        log.info("获取用户文档: userId={}", userId);
        
        return baseMapper.selectUserDocuments(userId, limit);
    }

    @Override
    public List<DocumentVO> getCategoryDocuments(String categoryId, String userId, Integer limit) {
        log.info("获取分类文档: categoryId={}, userId={}", categoryId, userId);
        
        return baseMapper.selectCategoryDocuments(categoryId, userId, limit);
    }

    @Override
    public List<DocumentVO> getHotDocuments(String userId, Integer limit) {
        log.info("获取热门文档: userId={}", userId);
        
        return baseMapper.selectHotDocuments(userId, limit);
    }

    @Override
    public List<DocumentVO> getLatestDocuments(String userId, Integer limit) {
        log.info("获取最新文档: userId={}", userId);
        
        return baseMapper.selectLatestDocuments(userId, limit);
    }

    @Override
    public List<DocumentVO> getRecommendedDocuments(String userId, Integer limit) {
        log.info("获取推荐文档: userId={}", userId);
        
        return baseMapper.selectRecommendedDocuments(userId, limit);
    }

    @Override
    public List<DocumentVO> getRelatedDocuments(String documentId, String userId, Integer limit) {
        log.info("获取相关文档: documentId={}, userId={}", documentId, userId);
        
        return baseMapper.selectRelatedDocuments(documentId, userId, limit);
    }

    @Override
    public List<DocumentVO> getFavoriteDocuments(String userId, Integer limit) {
        log.info("获取收藏文档: userId={}", userId);
        
        return baseMapper.selectFavoriteDocuments(userId, limit);
    }

    @Override
    public List<DocumentVO> getRecentDocuments(String userId, Integer limit) {
        log.info("获取最近访问文档: userId={}", userId);
        
        return baseMapper.selectRecentDocuments(userId, limit);
    }

    @Override
    public byte[] downloadDocument(String id, String userId) {
        log.info("下载文档: id={}, userId={}", id, userId);
        
        // 检查权限
        if (!checkDocumentPermission(id, userId, "download")) {
            throw new RuntimeException("无下载权限");
        }
        
        // 记录下载
        recordDocumentAccess(id, userId, "download");
        
        // TODO: 实现文件下载逻辑
        return null;
    }

    @Override
    public String previewDocument(String id, String userId) {
        log.info("预览文档: id={}, userId={}", id, userId);
        
        // 检查权限
        if (!checkDocumentPermission(id, userId, "view")) {
            throw new RuntimeException("无查看权限");
        }
        
        // 记录访问
        recordDocumentAccess(id, userId, "preview");
        
        // TODO: 实现文档预览逻辑
        return null;
    }

    @Override
    public String convertDocument(String id, String targetFormat, String userId) {
        log.info("转换文档格式: id={}, targetFormat={}, userId={}", id, targetFormat, userId);
        
        // TODO: 实现文档格式转换逻辑
        return null;
    }

    @Override
    public String extractDocumentContent(String id) {
        log.info("提取文档内容: {}", id);
        
        // TODO: 实现文档内容提取逻辑
        return null;
    }

    @Override
    public String generateDocumentSummary(String id) {
        log.info("生成文档摘要: {}", id);
        
        // TODO: 实现文档摘要生成逻辑
        return null;
    }

    @Override
    public Boolean checkDocumentPermission(String documentId, String userId, String permission) {
        log.info("检查文档权限: documentId={}, userId={}, permission={}", documentId, userId, permission);
        
        return baseMapper.checkDocumentPermission(documentId, userId, permission);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean favoriteDocument(String documentId, String userId) {
        log.info("收藏文档: documentId={}, userId={}", documentId, userId);
        
        return baseMapper.favoriteDocument(documentId, userId) > 0;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean unfavoriteDocument(String documentId, String userId) {
        log.info("取消收藏文档: documentId={}, userId={}", documentId, userId);
        
        return baseMapper.unfavoriteDocument(documentId, userId) > 0;
    }

    @Override
    public DocumentVO copyDocument(String sourceDocumentId, String newName, String userId) {
        log.info("复制文档: sourceDocumentId={}, newName={}, userId={}", sourceDocumentId, newName, userId);
        
        String newDocumentId = baseMapper.copyDocument(sourceDocumentId, newName, userId);
        Document newDocument = getById(newDocumentId);
        
        return convertToVO(newDocument);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean moveDocuments(List<String> documentIds, String categoryId) {
        log.info("移动文档: documentIds={}, categoryId={}", documentIds, categoryId);
        
        return baseMapper.batchMoveDocuments(documentIds, categoryId) > 0;
    }

    @Override
    public List<DocumentVO> getDocumentVersions(String documentId) {
        log.info("获取文档版本列表: documentId={}", documentId);
        
        return baseMapper.selectDocumentVersions(documentId);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public String createDocumentVersion(String documentId, String description, String userId) {
        log.info("创建文档版本: documentId={}, description={}, userId={}", documentId, description, userId);
        
        // 生成版本号
        String versionNumber = generateVersionNumber(documentId);
        
        return baseMapper.createDocumentVersion(documentId, versionNumber, description, userId);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean restoreDocumentVersion(String documentId, String versionId, String userId) {
        log.info("恢复文档版本: documentId={}, versionId={}, userId={}", documentId, versionId, userId);
        
        return baseMapper.restoreDocumentVersion(documentId, versionId, userId) > 0;
    }

    @Override
    public DocumentStatisticsVO getDocumentStatistics(String documentId) {
        log.info("获取文档统计信息: documentId={}", documentId);
        
        return baseMapper.selectDocumentStatistics(documentId);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean recordDocumentAccess(String documentId, String userId, String accessType) {
        log.info("记录文档访问: documentId={}, userId={}, accessType={}", documentId, userId, accessType);
        
        // 更新统计
        baseMapper.updateDocumentStatistics(documentId, accessType);
        
        // 记录访问日志
        return baseMapper.recordDocumentAccess(documentId, userId, accessType, null, null) > 0;
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Integer cleanupExpiredDocuments() {
        log.info("清理过期文档");
        
        return baseMapper.cleanupExpiredDocuments(LocalDateTime.now());
    }

    @Override
    public DocumentStatisticsVO getDocumentStorageStatistics(String userId) {
        log.info("获取文档存储统计: userId={}", userId);
        
        return baseMapper.selectDocumentStorageStatistics(userId);
    }

    /**
     * 转换为VO
     */
    private DocumentVO convertToVO(Document document) {
        DocumentVO vo = new DocumentVO();
        BeanUtils.copyProperties(document, vo);
        
        // TODO: 补充其他字段转换
        
        return vo;
    }

    /**
     * 生成版本号
     */
    private String generateVersionNumber(String documentId) {
        // TODO: 实现版本号生成逻辑
        return "1.0";
    }
}
